Samba Network Services Unintended Network Access Vulnerability [CVE-2018-16860]

CVE Number – CVE-2018-16860

A vulnerability in Samba could allow an authenticated, remote attacker to bypass security restrictions on a targeted system. The vulnerability is due to improper checksum validation by the S4U2Self handler of the affected software. An attacker with user access could exploit this vulnerability to conduct a man-in-the-middle attack on the targeted system. A successful exploit could result in unintended network access, which the attacker could use to conduct further attacks.Samba has confirmed the vulnerability and released software updates.


  • To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement could reduce the likelihood of a successful exploit.


  • Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to have network access.Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.Administrators can help protect affected systems from external attacks by using a solid firewall strategy.Administrators are advised to monitor affected systems.

Vendor Announcements

  • Samba has released a security advisory at the following link: CVE-2018-16860

Fixed Software

  • Samba has released software updates at the following links: Samba 4.10.3

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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